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Research progress on high volume and weight energy density lithium-sulfur batteries

2019-04-30 来源:亚科官网
 
Lithium-sulfur batteries are regarded as one of the ideal choices for the next generation of high-energy-density battery systems. They are highly regarded by scientific research circles and industry around the world, and are also one of the key research directions in the future.
A lithium-sulfur battery is a kind of lithium battery, and a lithium-sulfur battery is a lithium battery in which a sulfur element is used as a positive electrode of a battery and a lithium metal is used as a negative electrode. Elemental sulfur is abundant in the earth and has the characteristics of low price and environmental friendliness. Lithium-sulfur batteries using sulfur as a positive electrode material have higher theoretical theoretical specific capacity and battery theoretical energy, reaching 1675m Ah/g and 2600Wh/kg, respectively, which is much higher than the capacity of commercially available lithium cobalt oxide batteries (<150mAh/g). And sulfur is an environmentally friendly element that has no pollution to the environment and is a very promising lithium battery.
However, with the deepening of research, lithium-sulfur batteries are also facing increasingly serious challenges. The main problem currently exists is that the lithium-sulfur battery has a low volumetric energy density, which leads to its loss of competitiveness in many important market applications, and high electrolyte usage has also become a bottleneck for its weight energy density.
Liumin Suo, Associate Professor, E01 Group, Institute of Physics, Chinese Academy of Sciences/Beijing National Center for Condensed Matter Physics, collaborated with Professor Ju Li and Dr. Weijiang Xue from the Massachusetts Institute of Technology. In view of the common problem existing in lithium-sulfur batteries, the problem that the energy density of the battery device level is not high, it is innovatively proposed that the embedded electrode material Mo6S8 with high electron and ion conductance replaces the non-active material carbon to form an embedded-converted hybrid electrode. The sulfur positive electrode is reduced to less than 10 wt% under conditions of high active material loading (greater than 10 mg/cm2), and the electrolyte active material ratio is greatly reduced to 1.2 μL mg-1, and the electrode porosity is lower than 55 %. The battery pack with the new hybrid electrode has a large increase in energy density under the condition of ensuring cycle life, and can simultaneously achieve high volumetric energy density (581 Wh/L) and weight energy density (366 Wh/Kg), providing a new solution and practical commercial technology solution for the development of new high energy density lithium-sulfur batteries in the future.
The team said that in the future, it will continue to optimize the material preparation and packaging process of soft pack batteries, and at the same time combine the new research results of lithium anode and electrolyte to achieve early commercialization. Subsequent research will continue to enrich the research system along this line of thinking, and at the same time will focus on solving the last obstacle of the commercialization of lithium-sulfur batteries——the problems in the metal lithium negative electrode.
Edited by Suzhou Yacoo Science Co., Ltd.